x/(7.5+2.5)+(x-15)/(7.5-2.5)=9怎么解

题目详情

x/(7.5+2.5)+(x-15)/(7.5-2.5)=9 怎么解

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答案和解析

x/(7.5+2.5)+(x-15)/(7.5-2.5)=9
x/10+(x-15)/5=9
x/10 +x/5-3=9
3x/10=12
x= 12*10/3=40

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